This is a discussion on Just updated my OS on iPhone within the Tech Corner forums, part of the Everything But Cigars category; Hacker claims iPhone 5 jailbroken, Google Maps ported to iOS 6 - TechSpot News
there is a source
just google ...
I heard the new iOS is a data hog...causing extreme overages...seen this?
Yes actually there was a well written story about it during the release of the first iOS beta. It was because of the newest feature they added. What it does is the phone will switch between WiFi and Data depending on which one it believes to be faster. Many of the devs were shocked to see this, so what they did was turn off the setting, and everything returned back to normal.